Rotary drier.



C. B. SMITH.

ROTARY DRIER.

APPLICATION FILED 00T. 2B, 1912.

l,0'72,1 86. Patented Sept. 2, 1913.

Z SHEETS-BHEET l.

C. B. SMITH.

ROTARY DRIER.

APPLIoATIoN FILED oonzs, 1912.

1,072,1 86, 1 Patnted sept. 2, 1913.

2 SHEETS*SEBBT 2.

Zisjzamiy tion has PATENT' @hhlm apecicetion of Lettera Patent.

Patented sept. e, i913.

.application filed october 2d, 19m. aerial No. 7,208.

To all wh-om t may concern Be it known that l, (bien. Bass SMITH, acitizen of the United States, residing at Cleveland, in the county ofCuyahoga and State of Uhio, have invented certain new and. usefulimprovements in Rotary Driers, of which the following is aspecification..

My invention relates to the type of driers that are used for dryinggranu ated or pulverized material, such as sand or cement, wherein thematerial to, be treated is fed into one end of' an inclined, rotatingcylinder and discharged at the other end. ln the travel of the materialthrough the cylinder it is cascaded and agitated, permitting hot1 airfrom a heating medium to come 1n contact with, and impregnato the. massand thereby eliminate the moisture and thoroughly dry the material.

The objects of the invention are to provide a cylinder so constructedthat the greatest quantity of heat is imparted to the material at theprimary stage; the increasing of the heat distributin surface throu houtthe entire length of te cylinder an" at ythe same time (providing themeans for bringing the heate air fromthe furnace into direct contactwith the material in a most advantageous manner, thereb enhancinor theetiiciency of the drier by utilizing the heat so that the greatestbenefit is obtained therefrom. By this construction it is possible toeconomize in the size of-drier wlthout decreasil the capacity, and atthe same time obtain etter results with less time required,

by the emplo ing of a vast amount of the t yat in former drierconstruceen wasted.

In my invention I rovide at the feed. end of the drier` an anni iaryheater ordonble cylinder so .arranged that the mass of materlal,pregnant with moisture, is separated and subjected immediately to thedirect heat from the furnace and to the heat imparted from the combinedareas of the two cylinheat ener ders, thereby. giving. to the. materialthe greatest volume of heat atthe time when it contains the mostmoisture. From this rimarygtreatment the mxateriall passes into what mavbe called` a secondary" orton of the 031m er which le provided w1 h aseries c of lifting blades containing chambers in open communicationwith the furnace, whereby the two sides of the blades are heated tosubstantially the same de e as the casing, thus increasing the heatradidting area and creating a greater eiiiciency from the heat, byretaining an even temperature throughout the entire cylinder.

The invention also includes the providing of a series of longitudinal,radial, erforated yartitions that divide the interior of co artments,each of which is provided with thel improved blades which co-act withthe said partitions for cascading and agitatin the material.

`he embodiment of my invention is illustrated in the drawings forming apart of this specification in which- Figure l. is a longitudinal view ofthe drier and appurtenances, with the furnace and a portion of the`cylinder in horizontal, vertica section. Fig. 2. is an enlar edcrosssection on line 2-2 of Fi 1` and i 3. is a like view on line 3-3 oFig. l. Fig. 4 is a sectional view of one of the lifting blades on line4-4 of Fig. 5. Fig. 5. is a fragmentary view of one of the said blades.Fig. 6. is a fragmentary view of the cylinder showing the perforatedpartitions. Fig. 7. is an enla d Sectio al vlew on line 7--7 of Fig. 6.i 8 an 9 are fragmentary views showinga 'fting blade in juxtaposition toone of the artitions.

Similar c aracters of reference desi ate similar parts in the drawingsand specification.

In the construction of the improved drier the ordinary furnace is usedand the cylinder is mounted and rotated in anv manner well known tothose familiar with this art. While the casing of the cylinder 1 ispreferably continuous and of the same diameter throughout its entiretfrom the feed end to t-he discharge terminal, to facilitate theexplanation it will be referred to in sections. I construct the feed endof the casing for a certain predetermined distance, wlth an, outer shell1n of light gage sheet metal and a lining sheet 1" of heavier gage andperforated as shown. Within the porthe c inder into a number oflongitudinal.

i to ail driers o-f this type.

'close contact with the tion of the cylinder thus formed and concentrictherewit-h, is an auxiliary cylinder 1 provided with a jacket 1d,forming an annular chamber 1 The chamberle is in open connection withthe furnace chamber 2, through a series of tubes 1g. The heat from thechamber 2 is :drawn through the tubes 1g into the cham-y .bcr le andforward through the interlor of the thin outer shell la allows a higherdel gree of heat to penetrate to the interior, and

the combination of the two shells gives strength and durability to thissection of the casing. 'In this part of the cylinder the lifting bladesare dispensed with, the material being agitated by-rolling over 0nitself in two concentric shells, the temperature of the heat beingregulated according to the material to be treated. If

the material should be of such a consistency that an extremely highdegree of heat is desirable, which would intime burn that por- I tion ofthe cylinder directly over the fire ondly that o box, the entirecylinder is not rendered useless but can readily be repaired bysubstituting a new head section to conform to the unimpaired portion ofthe cylinder. It being feasible toattach the head portion of theremainder of the cylinder 'just beyond the fire zone.

Now proceeding to the construction of .the cylinder, for what may becalled, for convenience, the secondary treatment of the materlal, the vcylinder 1,A forwardv of the -ire zonecis provided with a series-oflifting blades 4, the particular construction .of

which will lpresently be described, these.

blades are attached to the interior of the shell, extend longitudinallytherein and, for.

the purpose of obtainingthe best results they are equally spacedcircumferentially.

The construction ofthe 'lifting blades is such that they perform a threefold function in the efficiency of the drier, first the cascading andagitating the material during its con-` tinuous passa e through thecylinder, secact-in as heat distributers auxiliary to'` the s ell of thecylinder and thirdly that'of providing air ducts from the furnace to theinterior of the cylinder, keeping the blades at a temperature that willfacilitate the drying and at the sameA time admitting heated air intothe cylinder throughout its length, and co-acting with closed at thehead end 1f.

i juxtaposition Locales the forced draft to kee through the cylinder aove the point of the air traveling saturation and always in condition toabsorb moisture.`

rllhe construction ofthe lifting blades is best shown in Figs. 4 and 5.To facilitate the manufacturing and assembling, the blades are made insections or units, each of which is provided with a angefln forattachment to the shell of the cylinder. An

air chamber 4b is provided inthe body of l the blade and has one or moreports 4 opening into the cylinder. The ports 4* are protected by hoods4d.

While in the construction of a cylinder as above described the drying iroperties are raised to a high degree of per ection, l propose tofurtherincrease the drying capacity by a series of perforated partitions5 placed vlongitudinally in the cylinder and dividing said cyllnder intoa series of compartments 5a. Each of said compartments contains one ofthe lifting blades 4. By the use of'these partitions material isdivided, and in the rotation of thecylin'der a certain amount of saidmaterial is continually escaping from one compartment to another throughthe perforations, and while in suspension it is subjected to the actionrof the heated air entering at the lower part of the cylinder, andrisingthrough the perforations in the plates. It will be lseen that by thecoc-'action of the lifting blades .with the perforated partitions andthe interior wallsof the cylinder, and during the rotation of saidcylinder, the cascading, "dropping and agitating of the material inconjunction with the counter currents of heated air combine to form ,adrier -of great eiiciency. The lifting blades may be placed midway ofthe compartments 5 or they, may be placed in to the partitions 5 as`shown in Fig. 8. rlfhe prevention of the inrush of air at the top ofdischarge end deris provided for by a stationary plate 6 which blinds aportion ofthe discharge opening. i

While I have described my invention as ,shown in drawings the detailedconstruction may vary in many respects, vbeing limited only so far asincluded in the claims of the cylinand made necessary by the priorstateofv the4 normen located within the main cylinder near the feedendthereof and concentric thereto, in combination with a cylindricalcasing surrounding said auxiliary cylinder, an annular air chamberbetween said cylindrical casing and the auxiliary cylinder, said airchamber being closed at the feed end and open at the opposite end, andair connections from the exterior of the main cylinder to the annularair chamber.

3. In a rotary drier, that portion of the feed end of the cylinderextending over the fire zone of the furnace, provided with.. aperforated lining,I in combination with an auxiliary cylinder locatedwithin the lined portion of the main cylinder, and concentric thereto, acylindrical lcasing surrounding the auxiliary cylinder, an annularairchamber between said cylindrical casing and the auxiliary cylinder,said air chamber being closed at the feed end and open at the oppositeend, and air connections from the exterior of the main cylinder to theannular air chamber, whereby heated air from the furnace circulatesthrough the auxiliary cylinder.

4. In a rotary drier, in combinationwith the main cylinder, an auxiliarycylinder located within the main cylinder, concentric thereto and at thefeed end thereof, over the fire zone of the furnace, a hopper adapt- 4edto feed material to both the main and auxiliary cylinders, an annularair chamber surrounding the auxiliary cylinder, said air chamber beingclosed at the feed end and open at the opposite end, and air connectionsfrom the exterior of the main cylinder to the annular air chamber nearthe feed end thereof, whereby heated air from the furnace circulatesthrough the said air chamber and the auxiliary cylinder.

5. In a rotary drier, a cylinder having a plurality of longitudinalshelves or blades therein, air chambers in the body of said blades,openings from said 'air chambers through the cylinder shell to theexterior thereof, and openings from the air chambers to the interior ofthe cylinder.

6. In a rotary drier, a cylinder having a plurality of longitudinalshelves or blades therein, said blades being attached to the cylindershell, air chambers in the body of said blades, openings from said airchambers through the cylinder shell to the exterior thereof, openingsfrom the air chambers to the interior of the cylinder, whereby heatedair is circulated from the furnace through the blades to the interior ofthe cylinder thereby heating said blades, and means for protectingtheopenings from the air cham# bers to the interior of cylinders toprevent he admission of material to said air chamers.

7. In a rotary drier, a cylinder provided lwitlr ai seriesoflongitudinal,A- radiah, perfo rated partitions, whereby said cylinder isi dividedinto a. series of compartments, longiitudinal shelves or bladesattached to the fshell within said compartments, air charnbers in thebody of said blades, openings 3 from said air chambers through thecylinder shell to the exterior thereof, openings from the lair chambersto the interior ofthe cylinder, whereby heated air is circulated fromthe furnace through the blades to the interior compartments, therebyheating the blades and distributing the heat, and means for protectinthe openings from the air chambers to t e interior of cylinder toprevent the admission of material to said air chamber.

8. In a rotary drier a cylinder having a plurality of longitudinalshelves or blades therein, air chambers in the body of said blades,openings from said air chambers through the cylinder shell, openingsfrom the air chambers to the interior of the cylinder, and a stationaryshield adapted to close the upper portion of the discharge opening ofthe cylinder, whereby the inrush of air to top of cylinder is prevented.9. In a rotary drier, the combination of a main cylinder, an auxiliarycylinder located within the main cylinder concentric therewith and atthe feed end thereof, over the tire zone of the furnace, a hopperadapted to feed lnaterial to both the main and auxiliary cylinders, anannular air chamber surrounding the auxiliary cylinder, said air chamberbeing closed at the feed end and open at the opposite end, airconnection from the exterior of the main cylinder to the annular airchamber, a plurality of longitudinal shelves in the main cylinderforward of the fire zone, air chambers in the body of said shelves,openings from said air chambers through the cylinder shell, openingsfrom the air chamber to the interior of the cylinder and means forprotecting the openings from the air chambers to the interior of thecylinder to prevent the admission of material to said au chamber.

10. In a rotary drier, the combination of a main drying cylinder, anauxiliary cylinder located within the main cylinder concentric therewithand at the feed end thereof extending over the tire zone of the furnace,an annular air chamber surrounding the auxiliary cylinder, said airchamber being closed at the feed end thereof, air connections from theexterior of the main cylinder to the annular air chamber, a series oflongitudinal, radial, 4perforated partitions arranged in the maincylinder forward of the fire zone and dividing the cylinder into aseries of compartments, longitudinal shelves attached to the shellwithin said com artments, air chambers in the body o the @4g l imma@shelves, o enings from said air chambers 'adapted to iprevent the inrushof air at the through Vt e lcylinder shell, openings from upper part ofthe discharge opening of the the air chambers to the interior of thecylincylinder.'

` der, means for protecting the openings from I CECIL BASS SMITH. 5 theair chambersto thev interior of the cylin- Wltnesses: Y v

der to prevent the admission of material into L. F. Gmswom,

said air chamber, and a stationary shieldl.v FRED C. SCHLATTER.

